Optical film roll, optical film, optical member, image display device

Abstract

Provided are an optical film roll, an optical film, an optical member, and an image display device. The optical film roll satisfies the following mathematical formula: H a ≥ 40 (1), 0 ≤ |(H a -H1)| / H a ≤ 0.1 (2). In the formulae, H1 is a plastic sphygmomanometer hardness [N / m] at a center point in the width direction of a most surface layer of the optical film roll, on the side opposite the front end at which the winding is completed; H a is an average value [N / m] of the plastic sphygmomanometer hardness at five points, which are a point 10 mm away from one end, a point W / 4 away from one end, a center point, a point 10 mm away from the other end, and a point W / 4 away from the other end, in the width direction of the side opposite the front end at which the winding is completed. W is the width [m] of the optical film on the side opposite the front end at which the winding is completed.

Description

Technical Field

[0001] This invention relates to optical thin film windings, optical thin films, optical components, image display devices, methods for manufacturing optical thin film windings, and methods for quality inspection of optical thin film windings. Background Technology

[0002] From the perspective of manufacturing efficiency, optical thin films are mostly manufactured in the form of long strip optical thin films and stored in the form of a rolled-up body of the long strip optical thin film (Patent Document 1, etc.).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-108849 Summary of the Invention

[0006] Problem to be solved by the invention

[0007] However, if the roll stiffness (pressure or tension applied to the optical film) of the optical film winding varies significantly or is uneven due to location, for example, if foreign objects are rolled into the part with high roll stiffness (pressure concentration), dents or breakage may occur. On the other hand, if the roll stiffness of the optical film winding is reduced (the tension applied to the optical film is reduced) to prevent dents and breakage, the optical film may be defective (e.g., wrinkles) due to winding misalignment, making it impossible to supply the optical film to subsequent processes.

[0008] Therefore, the object of the present invention is to provide an optical thin film winding body, an optical thin film, an optical component, an image display device, a method for manufacturing an optical thin film winding body, and a method for quality inspection of an optical thin film winding body, which can suppress or prevent the generation of cracks and dents even when the winding is hard and rigid.

[0009] Solution for solving the problem

[0010] To achieve the aforementioned objectives, the optical thin film winding of the present invention is characterized in that...

[0011] It is a wound structure of optical thin films.

[0012] On the outermost layer of the aforementioned optical thin film winding, the average hardness H of the plastic hardness tester... a The hardness H1 of the plastic hardness tester at the center point satisfies the following mathematical formulas (1) and (2).

[0013] H a ≥40 (1)

[0014] 0≤|(H a -H1)| / Ha ≤0.1 (2)

[0015] In the aforementioned mathematical expressions (1) and (2),

[0016] H1 is a plastic sphygmomanometer hardness [N / m] at a center point in a width direction of a most surface layer of the aforementioned optical film roll body, at a side opposite to a front end at which winding is finished,

[0017] H a is an average value [N / m] of plastic sphygmomanometer hardnesses at five points of a point at a distance of 10 mm from one end, a point at a distance of W / 4 from the aforementioned one end, a center point, a point at a distance of W / 4 from the other end, and a point at a distance of 10 mm from the aforementioned other end in a width direction of a side opposite to a front end at which winding is finished of the aforementioned optical film roll body.

[0018] where W is a width [m] of the aforementioned optical film of a side opposite to a front end at which winding is finished of the aforementioned optical film roll body.

[0019] The optical film of the present application is an optical film obtained by unrolling the aforementioned optical film roll body of the present application.

[0020] The optical member of the present application is an optical member including the optical film of the present application.

[0021] The image display device of the present application is an image display device including the optical film of the present application or the optical member of the present application.

[0022] The manufacturing method of the optical film roll body of the present application is characterized in that,

[0023] which is a method of manufacturing the aforementioned optical film roll body of the present application, includes a winding process of winding the aforementioned optical film to manufacture the aforementioned optical film roll body,

[0024] in the aforementioned winding process, the aforementioned optical film is wound in a manner that an average value H a of plastic sphygmomanometer hardnesses of a most surface layer of the aforementioned optical film roll body and a plastic sphygmomanometer hardness H1 at a center point satisfy the aforementioned mathematical expressions (1) and (2).

[0025] The quality inspection method of the optical film roll body of the present application is characterized in that,

[0026] whether an average value H a of plastic sphygmomanometer hardnesses of a most surface layer of the aforementioned optical film roll body and a plastic sphygmomanometer hardness H1 at a center point satisfy the aforementioned mathematical expressions (1) and (2) is confirmed by measurement.

[0027] Effects of the invention

[0028] According to the present invention, an optical thin film winding body, an optical thin film, an optical component, an image display device, a method for manufacturing an optical thin film winding body, and a method for quality inspection of an optical thin film winding body can be provided, which can suppress or prevent the generation of cracks and dents even if the winding is hard and rigid. Attached Figure Description

[0029] Figure 1 This is a perspective view showing an example of the optical thin film winding of the present invention.

[0030] Figure 2 It means and Figure 1 A diagram of the same optical thin film winding. Figure 2 (a) is a side view. Figure 2 (b) is the top view.

[0031] Figure 3 This is a cross-sectional view illustrating an example of the optical thin film of the present invention.

[0032] Figure 4 This is a diagram illustrating an example of the winding offset of the optical thin film winding of the present invention.

[0033] Reference signs list

[0034] 10 Optical Thin Films

[0035] 11. Translucent substrate (A)

[0036] 12. Functional Layer (B)

[0037] 12a Functional layer forming resin

[0038] 12b particles

[0039] 12c thixotropic agent

[0040] 100 Optical Thin Film Wrapper

[0041] The position of the front end of the outermost layer of the 100A winding 100, where the winding ends.

[0042] 100B The position of the outermost layer of the wound body 100, which is exactly opposite to the end of the winding front end 100A.

[0043] 100a winding shaft

[0044] 100b, 100c are perpendicular lines to the winding shaft 100a.

[0045] 110 core

[0046] h1, h 11 h 12 h21 22 Determination point of plastic scleroscope hardness

[0047] H1, H 11 12 21 22 Plastic scleroscope hardness DETAILED DESCRIPTION

[0048] Next, the present application will be described more specifically by citing examples. The present application is not limited at all to the following description.

[0049] In the optical film roll of the present application, for example, the aforementioned optical film can be an optical film having a plastic deformation amount of 85 nm or less and an elastic recovery rate of 80% or more when pressed using a nanoindenter method. Note that in the present application, the measurement method of the plastic deformation amount and the elastic recovery rate based on the nanoindenter method is not particularly limited, and for example, the measurement method described in the examples below can be used for measurement.

[0050] With regard to the optical film roll of the present application, for example, the relationship between the width and the length of the aforementioned optical film can satisfy the following mathematical expression (3).

[0051] 40 ≤ L / W ≤ 20000 (3)

[0052] In the aforementioned mathematical expression (3),

[0053] W is the width [m] of the aforementioned optical film,

[0054] L is the length [m] of the aforementioned optical film.

[0055] With regard to the optical film roll of the present application, for example, in the outermost layer of the aforementioned optical film roll, the plastic scleroscope hardness and the thickness of the aforementioned optical film at the determination point of the aforementioned plastic scleroscope hardness can satisfy the following mathematical expression (4). Note that in the present application, the measurement method of the plastic scleroscope hardness and the thickness is not particularly limited, and for example, the measurement method described in the examples below can be used for measurement.

[0056] 0.25 ≤ H a / D a ≤ 7 (4)

[0057] In the aforementioned mathematical expression (4),

[0058] H a ​​​​is the average value [N / m] of the plastic sphygmomanometer hardness at five points, which are a point at a distance of 10 mm from one end, a point at a distance of W / 4 from the one end, a center point, a point at a distance of W / 4 from the other end, and a point at a distance of 10 mm from the other end, in the width direction of the side opposite to the front end where the winding is finished, of the optical film roll body, where W is the width [m] of the optical film of the side opposite to the front end where the winding is finished, of the optical film roll body.

[0059] D a is the average value [μm] of the thickness of the optical film at the five points, which are the measurement points of the plastic sphygmomanometer hardness, of the optical film.

[0060] With regard to the optical film roll body of the present application, for example, the optical film can be an optical film having a surface with unevenness.

[0061] With regard to the optical film roll body of the present application, for example, the optical film can be an anti-glare film.

[0062] With regard to the optical film roll body of the present application, for example, the optical film can be a hard coat film.

[0063] With regard to the optical film roll body of the present application, for example, the optical film can be an anti-glare hard coat film.

[0064] The optical member of the present application can be, for example, a polarizing plate.

[0065] In the method for manufacturing the optical film roll body of the present application, for example, the optical film can be an optical film having a plastic deformation amount of 85 nm or less and an elastic recovery rate of 80% or more when pressed by a nanoindenter method.

[0066] In the method for manufacturing the optical film roll body of the present application, for example, the relationship between the width and the length of the optical film can satisfy the above mathematical expression (3).

[0067] In the method for manufacturing the optical film roll body of the present application, for example, in the winding process, the optical film can be wound in a manner that the relationship between the plastic sphygmomanometer hardness of the outermost layer of the optical film roll body and the thickness of the optical film at the measurement points of the plastic sphygmomanometer hardness satisfies the above mathematical expression (4).

[0068] In the method for manufacturing the optical film roll body of the present application, for example, the optical film can be an optical film having a surface with unevenness.

[0069] In the method for manufacturing the optical film roll body of the present application, for example, the optical film can be an anti-glare film.

[0070] In the method for producing the optical film roll of the present application, for example, the aforementioned optical film can be a hard coat film.

[0071] In the method for producing the optical film roll of the present application, for example, the aforementioned optical film can be an anti-glare hard coat film.

[0072] In the method for inspecting the quality of the optical film roll of the present application, for example, it can be confirmed by measurement that the aforementioned optical film is one in which the plastic deformation amount when pressed using a nanoindenter method is 85 nm or less and the elastic recovery rate is 80% or more.

[0073] In the method for inspecting the quality of the optical film roll of the present application, for example, it can be confirmed by measurement that the relationship between the width and the length of the aforementioned optical film satisfies the aforementioned mathematical expression (3).

[0074] In the method for inspecting the quality of the optical film roll of the present application, for example, it can be confirmed by measurement that the relationship between the plastic scribe hardness of the outermost layer of the aforementioned optical film roll and the thickness of the aforementioned optical film at the measurement point of the plastic scribe hardness satisfies the aforementioned mathematical expression (4).

[0075] In the method for inspecting the quality of the optical film roll of the present application, for example, the aforementioned optical film can be one in which the surface has unevenness.

[0076] In the method for inspecting the quality of the optical film roll of the present application, for example, the aforementioned optical film can be an anti-glare film.

[0077] In the method for inspecting the quality of the optical film roll of the present application, for example, the aforementioned optical film can be a hard coat film.

[0078] In the method for inspecting the quality of the optical film roll of the present application, for example, the aforementioned optical film can be an anti-glare hard coat film.

[0079] The optical member of the present application can be, for example, a polarizing plate.

[0080] Note that in the present application, "weight" and "mass" can be replaced with each other unless otherwise specified. For example, "mass parts" can be replaced with "weight parts", "weight parts" can be replaced with "mass parts", "mass %" can be replaced with "weight %", and "weight %" can be replaced with "mass %".

[0081] [1. Roll of optical film]

[0082] Hereinafter, the roll of optical film of the present application will be described more specifically by citing examples.

[0083] Figure 1The perspective view shows an example of the optical thin film winding body of the present invention. As shown, the optical thin film winding body 100 is a winding body of the optical thin film 10. On the outermost layer of the optical thin film winding body 100, the average value [N / m] of the plastic hardness at five points in the width direction on the side opposite to the front end of the winding end of the aforementioned optical thin film winding body is denoted as H. a [N / m]. The measurement points for the aforementioned five points and the hardness of the plastic hardness tester at these measurement points are shown below. That is, the center point in the width direction of the aforementioned optical film winding body, which is directly opposite to the front end of the winding end, is set as h1, and the hardness of the plastic hardness tester at h1 is set as H1 [N / m]. The point in the aforementioned width direction that is 10mm away from one end is set as h... 21 , will h 21 The hardness of the plastic hardness tester at that location is set to H. 21 [N / m]. Let h be the point in the aforementioned width direction that is W / 4 away from one end. 11 , will h 11 The hardness of the plastic hardness tester at that location is set to H. 11 [N / m]. Let h be the point 10mm away from the other end in the aforementioned width direction. 22 , will h 22 The hardness of the plastic hardness tester at that location is set to H. 22 [N / m]. Let h be the point in the aforementioned width direction that is W / 4 away from the other end. 12 , will h 12 The hardness of the plastic hardness tester at that location is set to H. 12 [N / m]. Wherein, W is the width [m] of the aforementioned optical film on the side opposite to the end of the winding of the aforementioned optical film winding body. h1, h 21 h 11 h 22 h 12 The hardness H1, H2, and H3 of the plastic hardness tester at these five points are... 21 H 11 H 22 H 12 Let the average value [N / m] be H. a [N / m]. Average hardness H of a plastic hardness tester. a The hardness H1[N / m] of the plastic hardness tester at center point h1 satisfies the aforementioned mathematical formulas (1) and (2).

[0084] It should be noted that, in this invention, "plastic hardness tester hardness" refers to the hardness obtained based on JIS K 6253, a JIS standard, and refers to the reaction force when the roll (wound body) is pressed with a certain force from the outside towards the core direction. Furthermore, in this invention, the method for measuring the hardness of the plastic hardness tester is not particularly limited; for example, the measurement method specified in the aforementioned JIS K 6253 can be used.

[0085] For the five points that serve as the measurement points for the hardness of the plastic hardness tester in the aforementioned mathematical formulas (1) and (2), for example, like Figure 1 h1 and h as explained in the text 21 h 11 h 22 h 12 That's how it is. Then, regarding... Figure 1 h1 and h as explained in the text 21 h 11 h 22 h 12 These five measurement points used Figure 2 Further explanation is needed. Figure 2 It is shown that... Figure 1 A diagram of the same optical thin film winding. Figure 2 (a) is a side view. Figure 2 (b) is a top view. Figure 2 In (a), 100A represents the position of the front end of the outermost layer of the winding 100 where the winding ends. Furthermore, in this figure, 100B represents the position of the side of the outermost layer of the winding 100 that is exactly opposite to the front end 100A where the winding ends. Figure 2 (b) shows five measurement points h1, h2, h3, h4, h5, h6, h7, h8, h9, h1 ...9, h1, h2, h9, h1, h2, h9, h1, h2, h9, h1, h2, h9, h1, h2, h9, h1, h2, h9, h1, 21 h 11 h 22 h 12 The positional relationship. h1 is the center point in the width direction at position 100B. That is, as shown in the figure, if the width at position 100B is set to W [m], then the distance from one end (the right end in the figure) to h1 in the width direction at position 100B is W / 2, and the distance from the other end (the left end in the figure) to h1 is also W / 2. As shown in the figure, h 21 It is the point at position 100B, located 10mm away from one end (the right end in the diagram) in the width direction. As shown in the diagram, h 11 It is the point located at position 100B, at a distance of W / 4 from one end (the right end in the diagram) in the width direction. Therefore, as shown in the diagram, the distance from center point h1 to h... 11 The distance is also W / 4. h22 h is a point at a distance of 10 mm in the width direction from the other end (left end in the figure) at the position of 100B. 12 h is a point at a distance of W / 4 in the width direction from the other end (left end in the figure) at the position of 100B. Thus, as illustrated, the center points h1 to h 12 are also at a distance of W / 4. As Figure 1 described in the foregoing, the plastic sphygmomanometer hardness at h1, h 21 , h 11 , h 22 , h 12 is set to H1, H 21 , H 11 , H 22 , H 12 [N / m], respectively, and the average value [N / m] of H1, H 21 , H 11 , H 22 , H 12 is set to H a [N / m]. The average value H a [N / m] of the plastic sphygmomanometer hardness satisfies the foregoing mathematical expressions (1) and (2) with the plastic sphygmomanometer hardness H1 [N / m] at the center point h1.

[0086] In the optical film roll of the present application, as indicated by the foregoing mathematical expression (1), the average value H a [N / m] of the foregoing plastic sphygmomanometer hardness is 40 or greater, for example, 45 or greater, 50 or greater, 55 or greater, or 60 or greater, and for example, 100 or less, 90 or less, 80 or less, or 70 or less. In order to prevent optical film defects (e.g., wrinkles, etc.) caused by winding misalignment, H a [N / m] must be 40 or greater. On the other hand, from the viewpoint of preventing deformation of the wound state, preventing the generation of point-like indentations, etc., H a [N / m] is preferably not excessively large.

[0087] In the optical film roll of the present application, as indicated by the foregoing mathematical expression (2), |(H a -H1)| / H a is 0 or greater and 0.1 or less, for example, 0.01 or greater, 0.02 or greater, 0.03 or greater, or 0.04 or greater, and for example, 0.09 or less, 0.08 or less, 0.07 or less, or 0.06 or less. |(H a -H1)| / H aA value as low as 0.1 indicates that the positional variation in the roll stiffness of the optical thin film winding is small and the unevenness is minimal. By making the roll stiffness of the optical thin film winding large (as described in the aforementioned mathematical formula (1)) and making the positional variation in roll stiffness small and the unevenness minimal (as described in the aforementioned mathematical formula (2)), it is possible to provide the optical thin film winding of the present invention that can suppress or prevent the generation of breakage and impact marks even if the roll stiffness is large and hard.

[0088] In the optical thin film winding of the present invention, as shown above, the amount of plastic deformation of the optical thin film when pressed using the nanoindentation method can be, for example, 85 nm or less. Furthermore, as shown above, the aforementioned optical thin film can be, for example, an optical thin film with an elastic recovery rate of 80% or more when pressed using the nanoindentation method. In this way, since the optical thin film itself is hard and difficult to deform, it is possible to further suppress or prevent point-like deformation defects such as impact marks. The aforementioned amount of plastic deformation can be, for example, 80 nm or less, 70 nm or less, 60 nm or less, or 50 nm or less; the lower limit is not particularly limited, for example, 0 nm or a value exceeding 0 nm, for example, 10 nm or more. The aforementioned elastic recovery rate can be, for example, 85% or more or 90% or more; the upper limit is not particularly limited, for example, 100% or less, or 95% or less.

[0089] The methods for determining the aforementioned amount of plastic deformation and the aforementioned rate of elastic recovery are not particularly limited. For example, they can be determined by the methods described in the embodiments below.

[0090] Regarding the optical thin film winding of the present invention, as described above, the value L / W obtained by dividing the length L [m] of the optical thin film by the width W [m] of the optical thin film can be 40 or more and 20,000 or less (the aforementioned mathematical formula (3)). In order to suppress or prevent the problem of winding deviation during the transport of the winding due to the optical thin film being too narrow in width or too long in length, L / W is preferably 20,000 or less. In order not to impair the productivity of the optical thin film winding due to the optical thin film being too wide in width or too short in length, L / W is preferably 40 or more. L / W can be, for example, 50 or more, 100 or more, 500 or more, or 1,000 or more, or for example, 15,000 or less, 10,000 or less, 5,000 or less, or 3,000 or less.

[0091] Regarding the optical thin film winding of the present invention, as described above, the average hardness H of the plastic hardness tester is found in the outermost layer of the aforementioned optical thin film winding. a [N / m] divided by the average thickness D of the aforementioned optical film at the measurement point of the aforementioned plastic hardness tester. a The value H obtained from [μm] a / D amay be 0.25 or more and 7 or less (the aforementioned mathematical expression (4)). From the viewpoint of suppressing or preventing the optical film roll body itself from easily leaving traces such as wrinkles or the balance of the hardness of the optical film roll body from deteriorating, H a / D a may be 7 or less. From the viewpoint of suppressing or preventing the risk of wrinkles and winding deviation caused by the winding of the optical film roll body becoming loose, H a / D a may be 0.25 or more. H a / D a For example, it may be 0.3 or more, 0.40 or more, 0.45 or more, 1.0 or more, or 2.0 or more, and for example, it may be 6.0 or less, 5.0 or less, 4.0 or less, or 3.0 or less.

[0092] [2. Optical film]

[0093] Next, examples are cited to specifically describe the optical film in the optical film roll body of the present application (hereinafter sometimes referred to as "the optical film of the present application").

[0094] The optical film of the present application is not particularly limited, and for example, like the above, it can be an optical film having a surface with unevenness. The surface of the optical film having a surface with unevenness is prone to slipping, and in the case of being made into an optical film roll body, winding deviation can occur. However, if it is the optical film roll body of the present application, even if the winding hardness is increased to be hard in order to suppress or prevent winding deviation, the generation of chipping and denting can be suppressed or prevented. As the optical film having a surface with unevenness, there is no particular limitation, and for example, anti-glare films, anti-glare hard coat films, anti-blocking treated films, embossed films, anti-reflection films, phase difference films, surface protective films, separators (release films), and the like can be cited. As described above, the optical film of the present application can be, for example, an anti-glare film, a hard coat film, an anti-glare hard coat film, and the like, and in addition, for example, it can be an anti-blocking treated film, an embossed film, and in addition, if the generation of winding deviation and denting defects can be suppressed, it can be a film having no unevenness and a flat surface, and the like.

[0095] When the optical film of the present application has a surface with unevenness, the shape of the aforementioned unevenness is not particularly limited.

[0096] The optical film of the present application is not particularly limited in constitution, and for example, can be constituted so that a functional layer (e.g., a coating layer) is formed on a light-transmissive substrate. The aforementioned light-transmissive substrate (hereinafter sometimes referred to as "light-transmissive substrate (A)") is not particularly limited, and for example, is as described later. The aforementioned functional layer is not particularly limited, and for example, can be an antiglare layer, a hard coat layer, an antiglare hard coat layer, an antireflection layer, a phase difference adjusting layer, a release film (separator), or the like. The aforementioned functional layer (hereinafter sometimes referred to as "functional layer (B)") can be, for example, a resin layer, and for example, can be a functional layer constituted of a thermosetting resin, an ionizing radiation-curable resin, or the like.

[0097] Figure 3 A cross-sectional view shows an example of the optical film of the present application. As shown, the optical film 10 has the functional layer (B) 12 laminated on one face of the light-transmissive substrate (A) 11. Figure 3 In the optical film 10, the functional layer (B) 12 is an antiglare hard coat layer. Regarding the antiglare hard coat layer (B) 12, the functional layer-forming resin 12a contains the particles 12b and the thixotropy imparting agent 12c.

[0098] Note that in the present application, the aforementioned functional layer (B) can be formed of only a resin, or can contain other components. The aforementioned other components are not particularly limited, and can be one or a plurality of, and for example, as shown in Figure 3 the aforementioned light-transmissive substrate (A), can be particles, a thixotropy imparting agent, or the like.

[0099] Further, the surface of the aforementioned functional layer (B) on the side opposite to the aforementioned light-transmissive substrate (A) can be flat, and for example, as shown in Figure 3 the aforementioned light-transmissive substrate (A), can be particles, a thixotropy imparting agent, or the like. As described above, the surface of the optical film having a surface with unevenness is liable to slip, and in the case where an optical film roll is produced, winding deviation can occur. However, if the optical film roll of the present application, even if the winding hardness is increased to make it hard in order to suppress or prevent winding deviation, the generation of cracks and dents can be suppressed or prevented.

[0100] Hereinafter, examples are further described regarding the aforementioned light-transmissive substrate (A) and the aforementioned functional layer (B).

[0101] The aforementioned light-transmissive substrate (A) is not particularly limited, and for example, a transparent plastic film substrate or the like can be exemplified. The aforementioned transparent plastic film substrate is not particularly limited, and preferably, a substrate in which the light transmittance of visible light is excellent (the light transmittance is preferably 90% or more), and the transparency is excellent (the haze value is preferably 1% or less), and for example, a transparent plastic film substrate described in Japanese Patent Application Laid-Open No. 2008-90263 can be exemplified. As the aforementioned transparent plastic film substrate, a substrate in which the optical birefringence is small is suitably used. The optical film of the present application can be used as a protective film for a polarizing plate, for example, and in this case, as the aforementioned transparent plastic film substrate, a film formed of cellulose triacetate (TAC), polycarbonate, an acrylic polymer, a polyolefin having a cyclic or norbornene structure, or the like is preferred. Furthermore, in the present application, as described later, the aforementioned transparent plastic film substrate can be the polarizing member itself. If this configuration is adopted, a protective layer formed of TAC or the like is not required, and the structure of the polarizing plate can be simplified, and thus, the number of manufacturing steps of the polarizing plate or the image display device can be reduced, and the improvement of the production efficiency can be achieved. Furthermore, if this configuration is adopted, the polarizing plate can be further thinned. Note that when the aforementioned transparent plastic film substrate is the polarizing member, the aforementioned functional layer (B) can also function as a protective layer, for example. Furthermore, if this configuration is adopted, the optical film can function as a cover plate, for example, when the optical film is attached to the surface of a liquid crystal cell.

[0102] In the present application, the thickness of the aforementioned light-transmissive substrate (A) is not particularly limited, and if the strength, the handling properties, and the like are taken into consideration, the thickness is in the range of 10 to 500 μm, 20 to 300 μm, or 30 to 200 μm, for example. The refractive index of the aforementioned light-transmissive substrate (A) is not particularly limited. The aforementioned refractive index is in the range of 1.30 to 1.80 or 1.40 to 1.70, for example.

[0103] With regard to the optical film of the present application, the resin contained in the aforementioned light-transmissive substrate (A) can contain an acrylic resin, for example.

[0104] With regard to the optical film of the present application, the aforementioned light-transmissive substrate (A) can be an acrylic film, for example.

[0105] As for the optical film of the present application, for example, as described above, the surface of the functional layer (B) on the side opposite to the light-transmissive substrate can have a concavo-convex. Further, for example, the external haze value caused by the concavo-convex can be 5% or more. For a high anti-glare film, there is a possibility that the overall appearance whitens and a black-and-white gradation pattern easily occurs. From the viewpoint of suppressing or preventing this, and from the viewpoint of suppressing reflected glare, it is preferable that the external haze value be as large as possible. On the other hand, from the viewpoint of suppressing or preventing a decrease in display characteristics (for example, image blurring, a decrease in contrast in a dark place, and the like), it is preferable that the external haze value not be too large. The external haze value is not particularly limited, and for example, can be 5% or more, 10% or more, 15% or more, or 20% or more, and for example, can be 50% or less, 45% or less, 40% or less, or 35% or less. In the present application, the method of measuring the external haze value is not particularly limited, and for example, can be measured using the measurement methods of (1) to (3) described below.

[0106] (1) The total haze value of the optical film of the present application is measured according to the method based on JIS K 713.

[0107] (2) A light-transmissive adhesive is layered on the side of the functional layer (B) of the optical film of the above (1) opposite to the light-transmissive substrate (A), and further, a COP film (manufactured by ZEON Corporation, trade name: ZEONOR FILM) is attached thereto, to produce a layered body. When this layered body is measured using the same measurement method as the measurement method of the total haze value based on JIS K 7136 (i.e., the measurement method of the above (1)), the internal haze value of the optical film of the above (1) can be obtained. This internal haze value is a haze value obtained by excluding the influence of the concavo-convex of the surface of the functional layer (B) side from the total haze value of the above (1).

[0108] (3) The value obtained by subtracting the internal haze value measured in the above (2) from the total haze value measured in the above (1) is set as the external haze value of the optical film of the above (1).

[0109] In the optical film of the present application, the resin contained in the functional layer (B) is not particularly limited, and for example, can include an acrylate resin (also referred to as an acrylic resin).

[0110] As for the optical film of the present application, for example, the resin contained in the functional layer (B) can include a urethane acrylate resin.

[0111] As the functional layer (B) of the optical film of the present application, for example, a copolymer of an oligomer having a functional group and a monomer can be used. As the oligomer having a functional group, there is no particular limitation, and for example, a curable urethane acrylate resin and the like can be given. As the curable urethane acrylate resin, for example, "UV-1700TL" manufactured by Mitsubishi Chemical Corporation, "UT-7314" manufactured by Mitsubishi Chemical Corporation, and the like can be given. As the monomer, there is no particular limitation, and for example, a multifunctional acrylate and the like can be given. As the multifunctional acrylate, for example, "M-920" manufactured by Toagosei Co., Ltd., and the like can be given.

[0112] As the functional layer (B) of the optical film of the present application, for example, a copolymer of a curable urethane acrylate resin and a multifunctional acrylate can be used.

[0113] Further, for example, the functional layer (B) can contain a surface modifier, and the element constituting the surface modifier can contain silicon. Further, the surface modifier can contain a silicon compound having a dimethylsiloxane skeleton. The surface modifier can be, for example, a leveling agent, a dimethylsiloxane-modified methacrylate, a polydimethylsiloxane cyclic compound, and the like. As the surface modifier, "LE-303" manufactured by K.K. Kyoeisha Chemical Co., "PC4100" manufactured by DIC Corporation, and the like can be given. The amount of the surface modifier to be added is not particularly limited.

[0114] In the optical film of the present application, the functional layer (B) is not particularly limited, and for example, can be a hard coat layer, and for example, can be an antiglare hard coat layer.

[0115] As the functional layer (B) of the optical film of the present application, for example, an antiglare hard coat layer-forming material containing a resin and a filler can be used, and the functional layer (B) can have aggregated portions that form convex portions on the surface of the functional layer (B) by aggregation of the filler. Further, in the aggregated portions that form the convex portions, the filler can exist in a state of being aggregated in a plurality of one direction along the surface direction of the functional layer (B). The image display device of the present application can be configured with the optical film of the present application in a manner in which the one direction in which the plurality of fillers are aggregated coincides with the long side direction of the black matrix pattern, for example. As the filler, for example, the aforementioned particles, the aforementioned thixotropy imparting agent, and the like can be given.

[0116] As described later, the aforementioned functional layer (B) is formed, for example, by forming a coating film by applying a coating liquid containing a resin and a dilution solvent to the surface of the aforementioned light-transmissive substrate (A), and then removing the aforementioned solvent from the aforementioned coating film. The aforementioned resin can be exemplified by a thermosetting resin, an ionizing radiation-curable resin which is cured by ultraviolet rays or light. As the aforementioned resin, commercially available thermosetting resins, ultraviolet-curable resins, and the like can also be used.

[0117] As the aforementioned thermosetting resins, ultraviolet-curable resins, for example, a curable compound having at least one group selected from the group consisting of an acrylate group and a methacrylate group which is cured by heat, light (ultraviolet rays, etc.), or electron rays, etc. can be used, and, for example, an oligomer or a prepolymer such as an acrylate, a methacrylate, or the like of a multifunctional compound such as a silicone resin, a polyester resin, a polyether resin, an epoxy resin, a urethane resin, an alkyd resin, a spiroacetal resin, a polybutadiene resin, a polysulfide polyene resin, a polyol, etc. can be exemplified. One kind thereof can be used alone, or two or more kinds thereof can be used in combination.

[0118] As the aforementioned resin, for example, a reactive diluent having at least one group selected from the group consisting of an acrylate group and a methacrylate group can be used. The aforementioned reactive diluent can be exemplified by a monofunctional acrylate, a monofunctional methacrylate, a multifunctional acrylate, a multifunctional methacrylate, etc. disclosed in Japanese Patent Application Publication No. 2008-88309, and the like. As the aforementioned reactive diluent, an acrylate having a functionality of three or more, a methacrylate having a functionality of three or more is preferred. This is because the hardness of the functional layer (B) can be made excellent. As the aforementioned reactive diluent, for example, a butanediol glyceryl ether diacrylate, an acrylate of isocyanuric acid, a methacrylate of isocyanuric acid, etc. can be exemplified. One kind thereof can be used alone, or two or more kinds thereof can be used in combination.

[0119] As described above, the aforementioned functional layer (B) can contain or can not contain a thixotropy-imparting agent. The aforementioned thixotropy-imparting agent can be, for example, at least one selected from the group consisting of an organic clay, an oxidized polyolefin, and a modified urea. Further, the aforementioned thixotropy-imparting agent can be, for example, a thickening agent. The aforementioned thixotropy-imparting agent can be used alone as one kind, or two or more kinds thereof can be used in combination.

[0120] In the optical film of the present application, the aforementioned thixotropy-imparting agent can be contained, for example, at 0.2 to 5% by mass or 0.4 to 4% by mass, with respect to the total mass of the resin forming the aforementioned functional layer (B).

[0121] As for the optical film of the present application, for example, a configuration in which another layer (C) is further laminated on the surface of the aforementioned functional layer (B) on the side opposite to the aforementioned light-transmissive substrate (A) can be exemplified. The aforementioned another layer (C) can be adhered to the aforementioned functional layer (B) with the aid of an adhesive layer, for example.

[0122] The aforementioned other layer (C) is not particularly limited, and can be, for example, a protective layer, a decorative layer, or the like. The aforementioned other layer (C) can be, for example, a glass or a resin film (plastic film). As the aforementioned resin film, there is no particular limitation, and for example, the trade name "E-MASK" series manufactured by Nippon ESR Co., Ltd. or the like can be cited. The thickness of the aforementioned other layer (C) is not particularly limited, and can be, for example, 10 μm or more, 20 μm or more, or 30 μm or more, and can be, for example, 80 μm or less, 70 μm or less, 60 μm or less, 50 μm or less, or 40 μm or less.

[0123] The aforementioned adhesive layer can be, for example, an adhesive layer formed of an adhesive (adhesive composition). In the present application, the aforementioned adhesive layer can be, for example, a layer capable of peeling the aforementioned other layer (C) from the aforementioned functional layer (B) again. The thickness of the aforementioned adhesive layer is not particularly limited, and can be, for example, 5 μm or more or 10 μm or more, and can be, for example, 50 μm or less, 40 μm or less, 30 μm or less, or 20 μm or less. The aforementioned adhesive is not particularly limited, and for example, a (meth)acrylic polymer or the like can be cited. For example, they can be dissolved or dispersed in a solvent to be in the form of a solution or a dispersion liquid, and used as the aforementioned adhesive (adhesive composition). As the aforementioned solvent, for example, ethyl acetate or the like can be cited, and one kind can be used alone or a plurality of kinds can be used in combination. The concentration of the solute or the dispersed substance (for example, the aforementioned acrylic polymer) in the aforementioned solution or dispersion liquid can be, for example, 10 mass% or more or 15 mass% or more, and can be, for example, 60 mass% or less, 50 mass% or less, 40 mass% or less, or 25 mass% or less. Note that, in the present application, "(meth)acrylic polymer" means a polymer or a copolymer of at least one kind of monomer of (meth)acrylic acid, (meth)acrylate, and (meth)acrylamide. Furthermore, in the present application, (meth)acrylic acid means "at least one kind of acrylic acid and methacrylic acid", and "(meth)acrylate" means "at least one kind of acrylate and methacrylate". As the aforementioned (meth)acrylate, for example, a linear alkyl ester or a branched alkyl ester of (meth)acrylic acid or the like can be cited. In the aforementioned linear alkyl ester or branched alkyl ester of (meth)acrylic acid, the number of carbon atoms of the alkyl group can be, for example, 1 or more, 2 or more, 3 or more, or 4 or more, and can be, for example, 18 or less, 16 or less, 14 or less, 12 or less, 10 or less, or 8 or less. The aforementioned alkyl group can be substituted with one or a plurality of substituents, or can be unsubstituted. The aforementioned substituents can be, for example, a hydroxyl group or the like, and in the case of a plurality, can be the same or different. As the aforementioned (meth)acrylate, specifically, for example, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, or the like can be cited. Furthermore, the aforementioned adhesive can be used alone or a plurality of kinds can be used in combination.

[0124] Further, the optical film of the present application can include other layers than the aforementioned light-transmissive substrate (A), the aforementioned functional layer (B), the aforementioned adhesive layer, the aforementioned other layer (C), and can not include them. The aforementioned other layer is not particularly limited, and for example, an easy-adhesion layer, an antireflection layer, a substrate layer to which an adhesive is attached, and the like can be exemplified.

[0125] [2. Method for manufacturing optical film]

[0126] The method for manufacturing the optical film of the present application is not particularly limited, and the optical film can be manufactured by any method, and for example, the optical film can be manufactured by the following operations.

[0127] First, the aforementioned functional layer (B) is formed on the aforementioned light-transmissive substrate (A) (functional layer (B) forming step). By this, a laminate of the aforementioned light-transmissive substrate (A) and the aforementioned functional layer (B) is manufactured. The aforementioned functional layer (B) forming step can include, for example, a coating step of coating a coating liquid for forming a resin layer (hereinafter, sometimes referred to simply as "coating liquid" or "functional layer (B) forming material") on the aforementioned light-transmissive substrate (A), and a coating film forming step of drying the coated aforementioned coating liquid to form a coating film. Further, for example, the aforementioned functional layer (B) forming step can further include a curing step of curing the aforementioned coating film. The aforementioned curing can be performed after the aforementioned drying, but is not limited thereto. The aforementioned curing can be performed, for example, by heating, light irradiation, or the like. The aforementioned light is not particularly limited, and for example, can be ultraviolet rays or the like. The light source of the aforementioned light irradiation is also not particularly limited, and for example, can be a high-pressure mercury lamp or the like.

[0128] The aforementioned coating liquid (functional layer (B) forming material) can be, for example, a coating liquid including the aforementioned resin and the aforementioned diluent solvent (hereinafter, sometimes referred to simply as "solvent"), as described above. The aforementioned coating liquid can include other components than them, and can not include them. As the aforementioned other components, there is no particular limitation, and for example, the aforementioned particles, the aforementioned thixotropicity-imparting agent, and the like can be exemplified.

[0129] The aforementioned solvent is not particularly limited, and various solvents can be used, either alone or in combination of two or more. Depending on the composition of the aforementioned resin, the kind and content of the aforementioned particles, and the kind of the aforementioned thixotropy-imparting agent, and the like, the optimum kind of solvent, the ratio of solvents can be appropriately selected in order to obtain the optical film of the present application. The solvent is not particularly limited, and, for example, alcohols such as methanol, ethanol, isopropyl alcohol (IPA), butanol, tert-butyl alcohol (TBA), 2-methoxyethanol, and the like; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, and the like; esters such as methyl acetate, ethyl acetate, butyl acetate, and the like; ethers such as diisopropyl ether, propylene glycol monomethyl ether, and the like; glycols such as ethylene glycol, propylene glycol, and the like; cellulose solvents such as ethyl cellosolve, butyl cellosolve, and the like; aliphatic hydrocarbons such as hexane, heptane, octane, and the like; aromatic hydrocarbons such as benzene, toluene, xylene, and the like; and the like can be exemplified. Further, for example, the aforementioned solvent can include a hydrocarbon solvent and a ketone solvent. The aforementioned hydrocarbon solvent can be, for example, an aromatic hydrocarbon. The aforementioned aromatic hydrocarbon can be, for example, at least one selected from the group consisting of toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, and benzene. The aforementioned ketone solvent can be, for example, at least one selected from the group consisting of cyclopentanone, acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, cyclohexanone, isophorone, and phenyl ethyl ketone. For example, in order to dissolve a thixotropy-imparting agent (e.g., a thickening agent), the aforementioned solvent preferably includes the aforementioned hydrocarbon solvent (e.g., toluene). The aforementioned solvent can be, for example, a solvent obtained by mixing the aforementioned hydrocarbon solvent and the aforementioned ketone solvent at a mass ratio of 90:10 to 10:90. The mass ratio of the aforementioned hydrocarbon solvent to the aforementioned ketone solvent can be, for example, 80:20 to 20:80, 70:30 to 30:70, or 40:60 to 60:40, and the like. In this case, for example, the aforementioned hydrocarbon solvent can be toluene, and the aforementioned ketone solvent can be methyl ethyl ketone. Further, the aforementioned solvent can include, for example, at least one selected from the group consisting of ethyl acetate, butyl acetate, IPA, methyl isobutyl ketone, methyl ethyl ketone, methanol, ethanol, and TBA, in addition to toluene.

[0130] As the light-transmissive substrate (A), for example, when an acrylic film is used to form the intermediate layer (permeation layer), a good solvent for the acrylic film (acrylic resin) can be appropriately used. As the solvent, for example, a solvent containing a hydrocarbon solvent and a ketone solvent can be used as described above. The aforementioned hydrocarbon solvent can be, for example, an aromatic hydrocarbon. The aforementioned aromatic hydrocarbon can be, for example, at least one selected from the group consisting of toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, and benzene. The aforementioned ketone solvent can be, for example, at least one selected from the group consisting of cyclopentanone, acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, cyclohexanone, isophorone, and phenylacetone. The aforementioned solvent can be, for example, a solvent obtained by mixing the aforementioned hydrocarbon solvent and the aforementioned ketone solvent at a mass ratio of 90:10 to 10:90. The mass ratio of the aforementioned hydrocarbon solvent and the aforementioned ketone solvent can be, for example, 80:20 to 20:80, 70:30 to 30:70, or 40:60 to 60:40, or the like. In this case, for example, the aforementioned hydrocarbon solvent can be toluene, and the aforementioned ketone solvent can be methyl ethyl ketone.

[0131] As the light-transmissive substrate (A), for example, when cellulose triacetate (TAC) is used, as the aforementioned solvent, there is no particular limitation, and, for example, ethyl acetate, methyl ethyl ketone, MIBK (methyl isobutyl ketone), cyclopentanone, or the like can be exemplified, and one kind alone or a plurality of kinds in combination can be used. At this time, the aforementioned solvent can be, for example, a mixed solvent of MIBK and cyclopentanone. The mixing ratio of MIBK and cyclopentanone is not particularly limited, and, for example, can be 90:10 to 10:90, 80:20 to 20:80, or 70:30 to 30:70 in terms of mass ratio.

[0132] Further, by appropriately selecting the solvent, it is possible to exhibit thixotropy of the anti-glare hard coat layer-forming material (coating liquid) with good performance even in the case where a thixotropy-imparting agent is contained. For example, in the case where an organic clay is used, toluene and xylene can be appropriately used alone or in combination, for example, in the case where an oxidized polyolefin is used, methyl ethyl ketone, ethyl acetate, and propylene glycol monomethyl ether can be appropriately used alone or in combination, and, for example, in the case where a modified urea is used, butyl acetate and methyl isobutyl ketone can be appropriately used alone or in combination.

[0133] Various leveling agents can be added to the aforementioned functional layer (B)-forming material. As the aforementioned leveling agent, for the purpose of preventing coating unevenness (uniformization of the coated surface), for example, a fluorine-based or silicone-based leveling agent can be used. The silicone-based leveling agent can also be used for the purpose of making the aforementioned functional layer (B) contain silicon as an element. In the present application, depending on whether or not the surface of the functional layer (B) is required to be antifouling, or whether or not an antireflection layer (low-refractive-index layer), a layer containing an interlayer filler, or the like is formed on the functional layer (B) as the aforementioned other layer (C), or the like, the leveling agent can be appropriately selected.

[0134] The compounding amount of the aforementioned leveling agent is, for example, 5 parts by weight or less, preferably 0.01 to 5 parts by weight, relative to 100 parts by weight of the aforementioned resin.

[0135] If necessary, pigments, fillers, dispersants, plasticizers, ultraviolet absorbers, surfactants, antifouling agents, antioxidants, and the like can be added to the aforementioned functional layer (B) forming material within a range not impairing the properties. These additives can be used singly or in combination of two or more.

[0136] The aforementioned functional layer (B) forming material can use, for example, the conventional known photopolymerization initiator described in Japanese Patent Application Publication No. 2008-88309.

[0137] As a method of forming a coating film by applying the aforementioned functional layer (B) forming material (coating liquid) to the aforementioned light-transmissive substrate (A), for example, fountain coating, die coating, spray coating, gravure coating, roll coating, bar coating, or the like can be used.

[0138] Next, the aforementioned coating film is subjected to drying and curing as described above, thereby forming a functional layer (B). The aforementioned drying can be, for example, natural drying, air drying by blowing, heating drying, or a combination thereof.

[0139] The drying temperature of the aforementioned functional layer (B) forming material (coating liquid) can be, for example, in the range of 30 to 200°C. The aforementioned drying temperature can be, for example, 40°C or higher, 50°C or higher, 60°C or higher, 70°C or higher, 80°C or higher, 90°C or higher, or 100°C or higher, or 190°C or lower, 180°C or lower, 170°C or lower, 160°C or lower, 150°C or lower, 140°C or lower, 135°C or lower, 130°C or lower, 120°C or lower, or 110°C or lower. The drying time is not particularly limited and can be, for example, 30 seconds or more, 40 seconds or more, 50 seconds or more, or 60 seconds or more, or 150 seconds or less, 130 seconds or less, 110 seconds or less, or 90 seconds or less.

[0140] The means of curing the aforementioned coating film is not particularly limited and is preferably ultraviolet curing. The irradiation amount of the energy ray source is preferably 50 to 500 mJ / cm 2 If the irradiation amount is 50 mJ / cm 2 or more, the curing is easily performed sufficiently and the hardness of the functional layer (B) formed is easily high. Further, if the irradiation amount is 500 mJ / cm 2 or less, coloring of the functional layer (B) formed can be prevented.

[0141] The aforementioned laminated body of the light-transmissive substrate (A) and the aforementioned functional layer (B) can be manufactured by the operation as described above. The laminated body can be directly used as the optical film of the present application, and for example, the optical film of the present application can be manufactured by pasting the aforementioned other layer (C) on the side of the aforementioned functional layer (B) opposite to the aforementioned light-transmissive substrate (A) with the aid of the aforementioned adhesive layer.

[0142] [3. Method for manufacturing optical film roll and method for inspecting quality of optical film roll]

[0143] Next, the method for manufacturing the optical film roll and the method for inspecting the quality of the optical film roll of the present application will be further concretely described by citing examples.

[0144] As described above, the method for manufacturing the optical film roll of the present application is characterized by comprising a winding process of winding the optical film to manufacture the optical film roll of the present application, and in the aforementioned winding process, the average value H a of the plastic sphygmomanometer hardness of the outermost layer of the optical film roll of the present application is measured, and the plastic sphygmomanometer hardness H1 of the center point of the optical film roll of the present application is measured, and it is determined whether the plastic sphygmomanometer hardness H1 of the center point satisfies the aforementioned mathematical expressions (1) and (2).

[0145] The aforementioned winding process is not particularly limited, and for example, the optical film of the present application can be manufactured in the same manner as the general method for manufacturing the optical film roll except that the optical film is wound in such a manner that the average value H a of the plastic sphygmomanometer hardness of the outermost layer of the optical film roll of the present application satisfies the aforementioned mathematical expressions (1) and (2). Specifically, for example, the optical film of the present application can be manufactured while continuously feeding the long strip-shaped light-transmissive substrate (A) and continuously forming the functional layer (B) and the adhesive layer, the other layer (C), and the like as needed, and at the same time, the optical film can be wound in such a manner that the aforementioned mathematical expressions (1) and (2) are satisfied.

[0146] Further, the method for manufacturing the optical film roll of the present application can include, for example, a quality inspection process of inspecting the quality of the manufactured optical film roll by the method for inspecting the quality of the optical film roll of the present application. As described above, the method for inspecting the quality of the optical film roll of the present application is characterized by confirming whether the average value H a of the plastic sphygmomanometer hardness of the outermost layer of the optical film roll of the present application satisfies the aforementioned mathematical expressions (1) and (2) by measurement. Further, in the present application, as described above, the method for measuring the plastic sphygmomanometer hardness is not particularly limited, and for example, the measurement method prescribed in the aforementioned JIS K 6253 can be used. Note that whether the optical film has a dent or not cannot be confirmed without unrolling the optical film roll and visually observing it. However, if it is confirmed by the measurement of the plastic sphygmomanometer hardness that the aforementioned mathematical expression (2) | (Ha -H1)| small, i.e. the unevenness in the roll hardness is small, it can be inferred that the optical film has few dents. In addition, the quality inspection method for the optical film roll body of the present application can, for example, check whether the manufactured optical film roll body satisfies a characteristic other than the aforementioned mathematical expressions (1) and (2). Specifically, for example, as described above, it can be confirmed by measurement whether the plastic sphygmomanometer hardness of the outermost layer of the aforementioned optical film roll body and the thickness of the aforementioned optical film at the measurement point of the aforementioned plastic sphygmomanometer hardness satisfy the relationship of the aforementioned mathematical expression (4).

[0147] As described above, if the roll hardness (the pressure or tension applied to the aforementioned optical film) of the optical film roll body is significantly different depending on the position, i.e. is significantly uneven, then, for example, in the case where a foreign matter or the like is wound in a portion where the roll hardness is large (the pressure is concentrated), it is possible that dents or cracks are generated. On the other hand, if the roll hardness of the optical film roll body is moderated (the tension applied to the optical film is moderated) in order to prevent the generation of dents and cracks, then it is possible that the optical film is adversely affected (for example, wrinkles or the like) due to winding deviation and the optical film cannot be supplied to a subsequent process. The present inventors and others have repeatedly researched in order to solve this problem and have found that the average value H a with the plastic sphygmomanometer hardness H1of the center point satisfies the aforementioned mathematical expressions (1) and (2). According to the present application, as described above, it is possible to provide an optical film roll body, an optical film, an optical member, an image display device, a manufacturing method for an optical film roll body, and a quality inspection method for an optical film roll body in which the generation of cracks and dents can be suppressed or prevented even if the roll hardness is large and hard.

[0148] Patent Document 1 also focuses on the sphygmomanometer hardness of a roll body of a thermoplastic resin film. However, the invention described in Patent Document 1 is characterized in that the sphygmomanometer hardness Hc of the central portion in the winding axis direction of the roll body and the sphygmomanometer hardness He of at least a portion of the roll body within 30 mm from the end portion in the winding axis direction are Hc + 3 < He. That is, the invention described in Patent Document 1 is characterized in that the sphygmomanometer hardness of the end portion in the winding axis direction of the roll body is larger than the sphygmomanometer hardness of the central portion in the winding axis direction of the roll body. In other words, the invention described in Patent Document 1 does not take as a necessary condition the small unevenness in the plastic sphygmomanometer hardness in the width direction of the optical film roll body as in the aforementioned mathematical expression (2) of the present application. This is because Patent Document 1 takes as a premise a film with a small winding surface roughness and smoothness, and therefore does not require high tension in order not to cause winding deviation. In contrast, the present inventors and others have found that the unevenness in the plastic sphygmomanometer hardness in the width direction of the optical film roll body is reduced as in the aforementioned mathematical expression (2), and the average value H a40 N / m or more. Thus, according to the present application, it is possible to provide an optical film roll, an optical film, an optical member, an image display device, a method for manufacturing an optical film roll, and a method for inspecting the quality of an optical film roll, in which even if an optical film having unevenness on the surface is used, the occurrence of defects (e.g., wrinkles) of the optical film caused by winding deviation can be suppressed or prevented, and the occurrence of chipping and dents can be suppressed or prevented. Note that the optical film of the present application is not limited to an optical film having unevenness on the surface, and can be an optical film having a flat surface without unevenness.

[0149] [4. Optical member and image display device]

[0150] The optical member of the present application is not particularly limited, and can be, for example, a polarizing plate. The aforementioned polarizing plate is also not particularly limited, and can include the optical film of the present application and a polarizing member, and can further include other constituent elements. The constituent elements of the aforementioned polarizing plate can be attached to each other by means of an adhesive or a bonding agent, or the like.

[0151] The image display device of the present application is also not particularly limited, and can be any image display device, and examples thereof include liquid crystal display devices, organic EL display devices, and the like.

[0152] The image display device of the present application can be, for example, an image display device having the optical film of the present application on the viewing side surface, and the aforementioned image display device can have a black matrix pattern.

[0153] The optical film of the present application can be attached to an optical member used in an image display device by means of an adhesive, a bonding agent, or the like, with the aforementioned light-transmissive substrate (A) side. Note that, at the time of this attachment, the aforementioned various surface treatments can be performed on the surface of the aforementioned light-transmissive substrate (A). As described above, according to the method for manufacturing an optical film of the present application, the surface shape of the optical film can be freely controlled in a wide range. Thus, in a wide range corresponding to the surface shape of the aforementioned optical film, optical properties that can be obtained by laminating the aforementioned optical film and other optical members using an adhesive, a bonding agent, or the like can be exhibited.

[0154] As the aforementioned optical member, a polarizing member or a polarizing plate can be cited, for example. A polarizing plate is generally configured to have a transparent protective film on one side or both sides of a polarizing member. In the case where a transparent protective film is provided on both surfaces of a polarizing member, the transparent protective films on the front and back surfaces can be the same material, or can be different materials. A polarizing plate is generally disposed on both sides of a liquid crystal cell. Furthermore, polarizing plates are disposed in such a manner that the absorption axes of the two polarizing plates are substantially orthogonal to each other.

[0155] The configuration of the polarizing plate in which the aforementioned optical film is laminated is not particularly limited, and for example, a configuration in which a transparent protective film, the aforementioned polarizing member, and the aforementioned transparent protective film are sequentially laminated on the aforementioned optical film, or a configuration in which the aforementioned polarizing member, the aforementioned transparent protective film are sequentially laminated on the aforementioned optical film can be used.

[0156] The image display device of the present application is configured in the same manner as conventional image display devices, except that the aforementioned optical film is disposed in a specific direction. For example, in the case of an LCD, each component such as a liquid crystal cell, optical members such as a polarizing plate, and an illumination system (backlight, etc.) as needed, etc. are appropriately assembled and mounted with a driving circuit, etc. to manufacture.

[0157] The use of the optical film of the present application is not particularly limited, and can be used for any purpose. As the use thereof, for example, personal computer displays, office automation equipment such as copiers, portable telephones, watches, digital cameras, portable information terminals (PDA), portable game machines, video recorders, television sets, microwave ovens, back-up monitors, monitors for car navigation systems, car audio equipment, display equipment for commercial stores, monitors for security equipment, monitors for nursing, nursing / medical equipment, etc. can be listed.

[0158] Examples

[0159] Next, the examples of the present application will be described together with the comparative examples. The present application is not limited to the following examples and comparative examples.

[0160] Note that in the following examples and comparative examples, the amount of a substance is a mass amount (weight amount) unless otherwise specified.

[0161] [Examples 1 to 7 and Comparative Examples 1 and 2]

[0162] The optical film roll bodies of Examples 1 to 7 and Comparative Examples 1 and 2 were manufactured by the following operations. As the optical film that becomes the raw material of the optical film roll body, the following optical film was used for each of Examples 1 to 7 and Comparative Examples 1 and 2.

[0163] The optical film roll bodies of Examples 1 to 7 and Comparative Examples 1 and 2 were manufactured by changing the width W [m] and the length L [m] of the optical film as described in Table 1 below, and changing the plastic sphygmomanometer hardness as described in Table 1 below. In Table 1 below, "average value [Ha]" of "sphygmomanometer hardness [H]" represents the average value H of the plastic sphygmomanometer hardness in the aforementioned mathematical expression (1) or mathematical expression (4) a [N / m]. "|(H a -H1)| / H a≤0.1” represents |(H a −H1)| / H in the aforementioned mathematical formula (2) a . W represents the width [m] of the optical thin film. "Plastic deformation amount" represents the plastic deformation amount [nm] when pressing the optical thin film using the nanoindentation method. "Elastic recovery rate" represents the elastic recovery rate [%] when pressing the optical thin film using the nanoindentation method. L represents the length [m] of the optical thin film. D represents the average value D of the thickness of the aforementioned optical thin film in the aforementioned mathematical formula (4) a [μm]. "Number of indentations" represents the number of indentations caused by foreign matters per 1 m 2 when visually observing the entire surface of the optical thin film obtained by unwinding the optical thin film winding body. It should be noted that an optical thin film with 10 or fewer indentations caused by foreign matters per 1 m 2 is determined as a qualified product, and an optical thin film with more than 10 indentations caused by foreign matters per 1 m 2 is determined as a non - qualified product.

[0164] The hardness of the plastic hardness tester is measured by the method of JIS K 6253. The winding offset amount of the optical thin film winding body, the number of indentations, the plastic deformation amount, the elastic deformation rate, and the thickness of the optical thin film are measured by the following methods respectively.

[0165] [Measurement of winding offset amount]

[0166] It is described using Figure 4 . At the position of the optical thin film that is the most forward with respect to the core 110 used in the winding of the optical thin film winding body 100, a perpendicular line 1 Hundred and four. W represents the width [m] of the optical thin film. "Plastic deformation amount" represents the plastic deformation amount [nm] when pressing the optical thin film using the nanoindentation method. "Elastic recovery rate" represents the elastic recovery rate [%] when pressing the optical thin film using the nanoindentation method. L represents the length [m] of the optical thin film. D represents the average value D of the thickness of the aforementioned optical thin film in the aforementioned mathematical formula (4) a [μm]. "Number of indentations" represents the number of indentations caused by foreign matters per 1 m 2 when visually observing the entire surface of the optical thin film obtained by unwinding the optical thin film winding body. It should be noted that an optical thin film with 10 or fewer indentations caused by foreign matters per 1 m 2 is determined as a qualified product, and an optical thin film with more than 10 indentations caused by foreign matters per 1 m 2 is determined as a non - qualified product.

[0164] The hardness of the plastic hardness tester is measured by the method of JIS K 6253. The winding offset amount of the optical thin film winding body, the number of indentations, the plastic deformation amount, the elastic deformation rate, and the thickness of the optical thin film are measured by the following methods respectively.

[0165] [Measurement of winding offset amount]

[0166] It is described using Figure 4 . At the position of the optical thin film that is the most forward with respect to the core 110 used in the winding of the optical thin film winding body 100, a perpendicular line 100b is drawn with respect to the winding axis 100a. On the other hand, at the position of the aforementioned optical thin film that is the most backward with respect to the core 110, a perpendicular line 100c is drawn with respect to the winding axis 100a. The distance X from the perpendicular line 100b to the perpendicular line 100c is defined as the winding offset amount.

[0167] [Statistics (counting) of the number of indentations in the optical thin film]

[0168] Unwind the manufactured optical thin film winding body, and take the optical thin film (L0) at the outermost layer, the optical thin film (L 2 ) at the middle position of the winding layer, and the optical thin film (L) closest to the core side in such a way that the total area reaches 1 m 1 / 2 respectively. For this total of 3 m 2 of optical thin film, use a three - wavelength fluorescent lamp as the light source, and at a position where the light source is at 45° with respect to the thin film, reflect the light of the thin film while counting the indentations. Determine ×, △, or ○ according to the following criteria, and count the samples determined as × as the number of indentations. And the average value of the statistical numbers (L0 + L It should be noted that there are some unclear or incorrect parts in the original text, such as the repeated and incomplete content in the middle part. This translation is based on the existing text as accurately as possible.1 / 2 +L) / 3 represents the number of impact marks in each embodiment [number / m] 2 [, as the evaluation result.]

[0169] ×: Distortion of reflected light was observed.

[0170] △: Slight distortion was observed, but it was within acceptable limits.

[0171] ○: No distortion of reflected light was observed.

[0172] [Method for determining the hardness of wound plastics using a hardness tester]

[0173] As described above, the hardness of the plastic hardness tester is determined using the method of JIS K 6253. The center point in the width direction of the aforementioned optical film winding body, directly opposite the end of the winding, is designated as h1, and the hardness of the plastic hardness tester measured at h1 is designated as H1 [N / m]. The point in the aforementioned width direction, 10 mm away from one end, is designated as h... 21 , will be in h 21 The hardness of the plastic measured by the hardness tester is set as H. 21 [N / m]. Let h be the point in the aforementioned width direction that is W / 4 away from one end. 11 , will be in h 11 The hardness of the plastic measured by the hardness tester is set as H. 11 [N / m]. Let h be the point 10mm away from the other end in the aforementioned width direction. 22 , will be in h 22 The hardness of the plastic measured by the hardness tester is set as H. 22 [N / m]. Let h be the point in the aforementioned width direction that is W / 4 away from the other end. 12 , will be in h 12 The hardness of the plastic measured by the hardness tester is set as H. 12 [N / m]. (The remaining text appears to be incomplete and contains errors.) 21 h 11 h 22 h 12 The hardness H1, H2, and H3 of the plastic hardness tester at these five points are... 21 H 11 H 22 H 12 Let the average value [N / m] be H. a [N / m]. Wherein, W is the width [m] of the aforementioned optical film on the side opposite to the front end of the aforementioned optical film winding body.

[0174] [A method for determining plastic deformation and elastic strain rate using nanoindentation]

[0175] The optical films of each example and comparative example used as test samples were cut into squares of about 1 cm, fixed to the specified support of the apparatus described below, and nanoindentation measurements were performed.

[0176] Device: Manufactured by HysitroN Inc., trade name "TriboiNdeNter"

[0177] Indenter used: Berkovic H (triangular pyramid type)

[0178] Measurement method: Single indentation measurement

[0179] Penetration depth: 500nm

[0180] When pressing the indenter under the above conditions, measure the maximum displacement (H). max After unloading, the amount of plastic deformation (H) is measured. F The indenter is pressed down to a depth of 500 nm as described above, then the load is unloaded. The distance from the sample plane to the pressurized part at the front of the indenter after unloading is measured, and this distance is defined as the amount of plastic deformation. The maximum displacement H is then determined. max [nm] and plastic deformation amount H F [nm], the elastic recovery rate is calculated according to the following mathematical formula.

[0181] Elastic recovery rate (%) = [(H) max -H F ) / H max ]×100

[0182] [Examples 1-7, Comparative Examples 1-2]

[0183] The following steps are performed to manufacture a hard coating forming material, which is then used to manufacture a hard coating film (optical film), and then the hard coating film is wound to manufacture an optical film wound.

[0184] [Example 1]

[0185] (Manufacturing of hard coating forming materials)

[0186] As a resin contained in the hard coat layer-forming material, 45 parts by weight of an ultraviolet-curable urethane acrylate resin (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "UA53H-80MB", solid content: 80%) and 55 parts by weight of a multifunctional acrylate having pentaerythritol triacrylate as a main component (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat #300", solid content: 100%) were prepared. With respect to 100 parts by weight of the resin solid content of the aforementioned resin, 3 parts by weight of a photopolymerization initiator (manufactured by BASF Co., trade name "OMNIRAD 907") and 0.05 parts by weight of a leveling agent (manufactured by DIC Co., trade name "GRANDIC PC4100", solid content: 10%) were mixed. The mixture was diluted with a mixed solvent of MIBK / butyl acetate (weight ratio: 50 / 50) so that the solid content concentration became 40%, and a hard coat layer-forming material (coating liquid, anti-glare hard coat layer (B)-forming material) was produced.

[0187] (Manufacture of hard coat film and optical film roll)

[0188] As the light-transmissive substrate (A), a transparent plastic film substrate (acrylic film, manufactured by Toyo Kohan Co., Ltd., trade name "HX40UF", thickness: 40 μm, film width: 1300 mm) was prepared. Using a die coater, the aforementioned anti-glare hard coat layer (B)-forming material (coating liquid) was continuously coated (coating step) on one side of the aforementioned transparent plastic film substrate (light-transmissive substrate (A)) over a length of 3000 m. The transparent plastic film substrate on which the undried coating film had been formed was then transported to a subsequent drying step (coating film formation step) at a speed of 30 m / sec. In the drying step (coating film formation step), the aforementioned undried coating film was dried by heating at 100°C for 1 minute, and a coating film was formed. Subsequently, the coating film was subjected to a curing treatment by irradiation with ultraviolet rays from a high-pressure mercury lamp at a cumulative light quantity of 300 mJ / cm 2 Thus, a hard coat film (optical film) was produced. The thickness of the hard coat layer was 6.0 μm.

[0189] Further, the hard coat film (optical film) on which the aforementioned continuous coating had been completed was directly transported while being wound at a winding tension of 200 N, and an optical film roll as the target was produced. As a result of measuring the plastic sphygmomanometer hardness of the optical film roll thus produced, H 21 = 69 N / m, H 11 = 73 N / m, H1= 72 N / m, H 12 = 72 N / m, H 22= 76 N / m. That is, the representative (average) value was 72 N / m, and the deviation was 1%. Further, the plastic deformation amount of the manufactured hard coat film in the sheet state was 75.9 μm, and the elastic recovery rate was 88.4%. The results of confirming the winding deviation amount were 0 mm, and the results of counting the number of indentations were 0 per m according to the aforementioned method 2 These results are shown in Table 1.

[0190] [Example 2]

[0191] As the resin contained in the hard coat layer-forming material, ultraviolet-curable urethane acrylate resin (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "UA53H-80MB", solid content 80%) 40 parts by weight, and multifunctional acrylate in which pentaerythritol triacrylate was the main component (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat #300", solid content 100%) 60 parts by weight were set, and winding of the continuously coated film was performed with the winding tension set to 230 N, and otherwise, the hard coat layer-forming material, the hard coat film (optical film), and the optical film winding body were manufactured using the same method as in Example 1. The results of measuring the plastic sphygmomanometer hardness of the optical film winding body thus manufactured were H 21 = 76 N / m, H 11 = 78 N / m, H 12 = 75 N / m, H 22 = 77 N / m. That is, the representative (average) value was 76 N / m, and the deviation was 3%. Further, the plastic deformation amount of the manufactured hard coat film in the sheet state was 79.5 μm, and the elastic recovery rate was 85.4%. The results of confirming the winding deviation amount were 0 mm, and the results of counting the number of indentations were 1 per m according to the aforementioned method 2 These results are shown in Table 1.

[0192] [Example 3]

[0193] As the resin contained in the hard coat layer-forming material, ultraviolet-curable urethane acrylate resin (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "UA53H-80MB", solid content 80%) 30 parts by weight, and multifunctional acrylate in which pentaerythritol triacrylate was the main component (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat #300", solid content 100%) 70 parts by weight were set, and winding of the continuously coated film was performed with the winding tension set to 200 N, and otherwise, the hard coat layer-forming material, the hard coat film (optical film), and the optical film winding body were manufactured using the same method as in Example 1. The results of measuring the plastic sphygmomanometer hardness of the optical film winding body thus manufactured were H 21 = 65 N / m, H11 = 68 N / m, Hi = 73 N / m, H 12 = 71 N / m, H 22 = 70 N / m. That is, the representative (average) value was 69 N / m, and the deviation was 5%. Further, the plastic deformation amount of the hard coat film manufactured in the sheet state was 86.2 μm, and the elastic recovery rate was 78.4%. The results of confirming the winding deviation amount were 0 mm, and the results of counting the number of indentations were 3 per m 2 The results are summarized in Table 1.

[0194] [Example 4]

[0195] As the light-transmissive substrate (A), a transparent plastic film substrate (acrylic film, manufactured by Toyo Steel Plate Co., trade name "HX40UF", thickness: 40 μm, film width: 300 mm) was prepared, the aforementioned antiglare hard coat layer (B) forming material (coating solution) was continuously coated (applied) 6500 m using a die coater, and the tension at the time of winding was set to 60 N, and otherwise, the hard coat layer forming material, hard coat film (optical film), and optical film winding body were manufactured using the same method as described in Example 2. The results of measuring the plastic sphygmomanometer hardness of the optical film winding body thus manufactured were H 21 = 74 N / m, Hi = 73 N / m, H 11 = 68 N / m, Hi = 72 N / m, H 12 = 75 N / m, H 22 = 69 N / m. That is, the representative (average) value was 72 N / m, and the deviation was 5%. The results of confirming the winding deviation amount were 2 mm, and the results of counting the number of indentations were 1 per m 2 The results are summarized in Table 1.

[0196] [Example 5]

[0197] As the light-transmissive substrate (A), a transparent plastic film substrate (acrylic film, manufactured by Toyo Steel Plate Co., trade name "HX40UF", thickness: 40 μm, film width: 2500 mm) was prepared, the aforementioned antiglare hard coat layer (B) forming material (coating solution) was continuously coated (applied) 50 m using a die coater, and the tension at the time of winding was set to 400 N, and otherwise, the hard coat layer forming material, hard coat film (optical film), and optical film winding body were manufactured using the same method as described in Example 2. The results of measuring the plastic sphygmomanometer hardness of the optical film winding body thus manufactured were H 21 = 77 N / m, Hi = 73 N / m, H 11 = 78 N / m, Hi = 78 N / m, H 12 = 80 N / m, H 22= 79 N / m. That is, the representative (average) value is 78 N / m, and the deviation is 1%. The results of confirming the winding deviation were 0 mm, and the results of counting the number of dents were 0 per m according to the aforementioned method 2 The results are summarized in Table 1.

[0198] [Example 6]

[0199] As the light-transmissive substrate (A), a transparent plastic film substrate (PET film, manufactured by TOYOBO CO., LTD., trade name "Lumirror", thickness: 188 μm, film width: 1300 mm) was prepared, the aforementioned antiglare hard coat layer (B) forming material (coating liquid) was continuously coated (applied) 2000 m using a die coater, and the tension at the time of winding was set to 400 N, and otherwise, a hard coat layer forming material, a hard coat film (optical film), and an optical film winding body were manufactured using the same method as described in Example 2. The results of measuring the plastic sphygmomanometer hardness of the optical film winding body thus manufactured were H 21 = 44 N / m, H 11 = 47 N / m, H1= 43 N / m, H 12 = 44 N / m, H 22 = 48 N / m. That is, the representative (average) value is 45 N / m, and the deviation is 5%. The results of confirming the winding deviation were 4 mm, and the results of counting the number of dents were 0 per m according to the aforementioned method 2 The results are summarized in Table 1.

[0200] [Example 7]

[0201] As the light-transmissive substrate (A), a transparent plastic film substrate (COP film, manufactured by ZEON CORPORATION, trade name "ZF series", thickness: 13 μm, film width: 1300 mm) was prepared, the aforementioned antiglare hard coat layer (B) forming material (coating liquid) was continuously coated (applied) 3000 m using a die coater, and the tension at the time of winding was set to 200 N, and otherwise, a hard coat layer forming material, a hard coat film (optical film), and an optical film winding body were manufactured using the same method as described in Example 2. The results of measuring the plastic sphygmomanometer hardness of the optical film winding body thus manufactured were H 21 = 87 N / m, H 11 = 88 N / m, H1= 91 N / m, H 12 = 94 N / m, H 22 = 89 N / m. That is, the representative (average) value is 90 N / m, and the deviation is 1%. The results of confirming the winding deviation were 0 mm, and the results of counting the number of dents were 3 per m according to the aforementioned method 2 The results are summarized in Table 1.

[0202] [Comparative Example 1]

[0203] The take-up of the finished continuously coated film was performed under the condition that the take-up tension was 70 N, and otherwise, the hard coat layer forming material, the hard coat film (optical film) and the optical film roll were manufactured by the same method as in Example 1. As a result of measuring the plastic sphygmomanometer hardness of the optical film roll thus manufactured, H 21 = 31 N / m, H 11 = 28 N / m, H1= 29 N / m, H 12 = 32 N / m, H 22 = 28 N / m. That is, the representative (average) value was 30 N / m, and the deviation amount was 2%. As a result of confirming the roll-off amount according to the aforementioned method, it was 10 mm, and as a result of counting the number of dents, it was 0 / m 2 These results are shown in Table 1.

[0204] [Comparative Example 2]

[0205] The continuous coating was performed at a speed of 10 m / min under the condition that the take-up tension was 300 N, and otherwise, the hard coat layer forming material, the hard coat film (optical film) and the optical film roll were manufactured by the same method as in Example 1. As a result of measuring the plastic sphygmomanometer hardness of the optical film roll thus manufactured, H 21 = 72 N / m, H 11 = 58 N / m, H1= 58 N / m, H 12 = 65 N / m, H 22 = 72 N / m. That is, the representative (average) value was 65 N / m, and the deviation amount was about 11%. As a result of confirming the roll-off amount according to the aforementioned method, it was 0 mm, and as a result of counting the number of dents, it was 40 / m 2 These results are shown in Table 1.

[0206] [Table 1]

[0207]

[0208] As shown in the aforementioned Table 1, the optical film rolls of Examples 1 to 7 were extremely small in roll-off, and extremely few in dents caused by foreign matter. In contrast, in Comparative Example 1, the average value H a [N / m] of the plastic sphygmomanometer hardness in the aforementioned mathematical formula (1) was 30 N / m (i.e., less than 40 N / m), that is, the roll was loose, and as a result, the roll-off was large compared to the examples. Further, in Comparative Example 2, the value of |(H a -H1)| / H a in the aforementioned mathematical formula (2) was about 11% (i.e., 0.11, exceeding 0.1), and the deviation of the plastic sphygmomanometer hardness was large, and as a result, the dents caused by foreign matter were extremely many compared to the examples.

[0209] Industrial applicability

[0210] In view of the foregoing, according to the present application, it is possible to provide an optical film roll body, an optical film, an optical member, an image display device, a method for manufacturing an optical film roll body, and a method for inspecting the quality of an optical film roll body, in which even if the roll hardness is large and hard, the generation of cracks and dents can be suppressed or prevented. The present application is particularly suitable for an optical film having a surface with unevenness, but is not limited thereto, and can be applied to all optical films. Therefore, the optical member, the image display device, and the like of the present application are not particularly limited, and the present application can be applied to all optical members, image display devices, and the like.

[0211] This application claims priority based on Japanese Patent Application No. 2021-004741 filed on January 15, 2021, the entire disclosure of which is hereby incorporated by reference.

Claims

1. An optical thin film roll, characterized in that, It is a wound optical film containing an acrylic film as a substrate. The average hardness H of the plastic hardness tester is found on the outermost layer of the optical thin film winding. a The hardness H1 of the plastic hardness tester at the center point satisfies the following mathematical formulas (1) and (2). H a ≥40 (1) 0≤| (H a -H1) | / H a ≤0.1 (2) In the mathematical expressions (1) and (2), H1 is the plastic hardness measured at the center point in the width direction of the outermost layer of the optical film winding, on the side opposite to the end of the winding. Its unit is N / m. H a It is the average hardness of the plastic hardness measured at five points along the width direction on the side opposite to the end of the winding of the optical thin film roll: a point 10mm away from one end, a point W / 4 away from one end, the center point, a point W / 4 away from the other end, and a point 10mm away from the other end. The unit is N / m. Wherein, W is the width of the optical film on the side opposite to the end of the winding of the optical film roll, and its unit is meters (m). The optical film is an optical film with a plastic deformation of less than 85 Nm and an elastic recovery rate of more than 80% when pressed using the nanoindentation method.

2. The optical thin film winding according to claim 1, wherein, The relationship between the width and length of the optical thin film satisfies the following mathematical formula (3). 40≤L / W≤20000 (3) In the mathematical formula (3), W represents the width of the optical thin film, measured in meters (m). L is the length of the optical thin film, and its unit is m.

3. The optical thin film winding according to claim 1 or 2, wherein, At the outermost layer of the optical film winding, the hardness of the plastic hardness tester and the thickness of the optical film at the measurement point of the plastic hardness tester satisfy the following mathematical formula (4). 0.25≤H a / D a ≤7 (4) In the mathematical expression (4), H a It is the average hardness of the plastic hardness measured at five points along the width direction on the side opposite to the end of the winding of the optical thin film roll: a point 10mm away from one end, a point W / 4 away from one end, the center point, a point W / 4 away from the other end, and a point 10mm away from the other end. The unit is N / m. Wherein, W is the width of the optical film on the side opposite to the end of the winding of the optical film roll, and its unit is meters (m). D a The average thickness of the optical film at the five points used to measure the hardness of the plastic hardness tester is expressed in μm.

4. The optical thin film winding according to claim 1 or 2, wherein, The optical thin film is an optical thin film with an uneven surface.

5. The optical thin film winding according to claim 1 or 2, wherein, The optical film is an anti-glare film.

6. The optical thin film winding according to claim 1 or 2, wherein, The optical thin film is a hard-coated thin film.

7. The optical thin film winding according to claim 1 or 2, wherein, The optical film is an anti-glare hard coating film.

8. An optical thin film obtained by unwinding an optical thin film roll according to any one of claims 1 to 7.

9. An optical component comprising the optical thin film of claim 8.

10. The optical component according to claim 9, wherein it is a polarizing plate.

11. An image display device comprising the optical thin film of claim 8, or the optical component of claim 9 or 10.

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